You can do a lot in Logic's environment. And also many DAW's have support for MIDI FX plugins Not saying compositional aids couldn't be easier or have differen

You can do a lot in Logic's environment. And also many DAW's have support for MIDI FX plugins Not saying compositional aids couldn't be easier or have different UX paradigms, but there are tools in today's DAW's. Would be pretty cool if Jacob Collier got together with a developer to write a compositional aid tool for harmonising.